<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">

        <h3>msg:{{msg}} {{msg}}</h3><hr/>
        <h3>msg:{{msg}}</h3><hr/>
        <h3>msg:{{msg}}</h3><hr/>
        <h3>msg:{{msg}}</h3><hr/>
        <h3>msg:{{msg}}</h3><hr/>
        <h3>msg:{{msg}}</h3><hr/>
 
    </div>
    <script src="./Observer.js"></script>
    <script src="./MVue.js"></script>
    <script>
        let vm = new MVue({
            el:"#app",
            data:{
                
                msg:"我是msg",
            }
        })
    </script>
</body>
</html>